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1
Soak haricots blancs overnight; drain and rinse thoroughly.
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2
Blanch haricots in fresh water with bouquet garni and onion for 90 minutes until tender; reserve cooking liquid, discard aromatics.
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3
Render pancetta in Dutch oven over medium heat until crisp; remove and set aside. Brown Toulouse sausage whole in rendered fat, remove and slice into 5cm pieces.
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4
Layer cassole earthenware dish: half the beans with cooking liquid, then duck confit pieces, sausage, pancetta, remaining beans and liquid.
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5
Combine breadcrumbs with 50ml duck fat and crushed garlic; distribute across surface.
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6
Bake at 160°C for 120 minutes; press breadcrumb crust down every 30 minutes, add reserved cooking liquid as needed to keep beans submerged.
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7
Increase to 200°C for final 30 minutes until golden crust forms; rest 10 minutes before serving.